Commit | Line | Data |
---|---|---|
5b83683f HY |
1 | /* |
2 | * Common EFI (Extensible Firmware Interface) support functions | |
3 | * Based on Extensible Firmware Interface Specification version 1.0 | |
4 | * | |
5 | * Copyright (C) 1999 VA Linux Systems | |
6 | * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> | |
7 | * Copyright (C) 1999-2002 Hewlett-Packard Co. | |
8 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
9 | * Stephane Eranian <eranian@hpl.hp.com> | |
10 | * Copyright (C) 2005-2008 Intel Co. | |
11 | * Fenghua Yu <fenghua.yu@intel.com> | |
12 | * Bibo Mao <bibo.mao@intel.com> | |
13 | * Chandramouli Narayanan <mouli@linux.intel.com> | |
14 | * Huang Ying <ying.huang@intel.com> | |
d2f7cbe7 BP |
15 | * Copyright (C) 2013 SuSE Labs |
16 | * Borislav Petkov <bp@suse.de> - runtime services VA mapping | |
5b83683f HY |
17 | * |
18 | * Copied from efi_32.c to eliminate the duplicated code between EFI | |
19 | * 32/64 support code. --ying 2007-10-26 | |
20 | * | |
21 | * All EFI Runtime Services are not implemented yet as EFI only | |
22 | * supports physical mode addressing on SoftSDV. This is to be fixed | |
23 | * in a future version. --drummond 1999-07-20 | |
24 | * | |
25 | * Implemented EFI runtime services and virtual mode calls. --davidm | |
26 | * | |
27 | * Goutham Rao: <goutham.rao@intel.com> | |
28 | * Skip non-WB memory and ignore empty memory ranges. | |
29 | */ | |
30 | ||
e3cb3f5a OJ |
31 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
32 | ||
5b83683f HY |
33 | #include <linux/kernel.h> |
34 | #include <linux/init.h> | |
35 | #include <linux/efi.h> | |
2223af38 | 36 | #include <linux/efi-bgrt.h> |
69c60c88 | 37 | #include <linux/export.h> |
5b83683f | 38 | #include <linux/bootmem.h> |
0d01ff25 | 39 | #include <linux/slab.h> |
a9ce6bc1 | 40 | #include <linux/memblock.h> |
5b83683f HY |
41 | #include <linux/spinlock.h> |
42 | #include <linux/uaccess.h> | |
43 | #include <linux/time.h> | |
44 | #include <linux/io.h> | |
45 | #include <linux/reboot.h> | |
46 | #include <linux/bcd.h> | |
47 | ||
48 | #include <asm/setup.h> | |
49 | #include <asm/efi.h> | |
50 | #include <asm/time.h> | |
a2172e25 HY |
51 | #include <asm/cacheflush.h> |
52 | #include <asm/tlbflush.h> | |
7bd867df | 53 | #include <asm/x86_init.h> |
3195ef59 | 54 | #include <asm/rtc.h> |
a5d90c92 | 55 | #include <asm/uv/uv.h> |
5b83683f | 56 | |
f4fccac0 | 57 | #define EFI_DEBUG |
5b83683f | 58 | |
5b83683f HY |
59 | struct efi_memory_map memmap; |
60 | ||
ecaea42e | 61 | static struct efi efi_phys __initdata; |
5b83683f HY |
62 | static efi_system_table_t efi_systab __initdata; |
63 | ||
9b7d2049 | 64 | static efi_config_table_type_t arch_tables[] __initdata = { |
272686bf LL |
65 | #ifdef CONFIG_X86_UV |
66 | {UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab}, | |
67 | #endif | |
722da9d2 | 68 | {NULL_GUID, NULL, NULL}, |
272686bf LL |
69 | }; |
70 | ||
1fec0533 | 71 | u64 efi_setup; /* efi setup_data physical address */ |
926172d4 | 72 | |
9b7d2049 | 73 | static bool disable_runtime __initdata = false; |
8b2cb7a8 HY |
74 | static int __init setup_noefi(char *arg) |
75 | { | |
fb834c7a | 76 | disable_runtime = true; |
8b2cb7a8 HY |
77 | return 0; |
78 | } | |
79 | early_param("noefi", setup_noefi); | |
80 | ||
200001eb PJ |
81 | int add_efi_memmap; |
82 | EXPORT_SYMBOL(add_efi_memmap); | |
83 | ||
84 | static int __init setup_add_efi_memmap(char *arg) | |
85 | { | |
86 | add_efi_memmap = 1; | |
87 | return 0; | |
88 | } | |
89 | early_param("add_efi_memmap", setup_add_efi_memmap); | |
90 | ||
5b83683f HY |
91 | static efi_status_t __init phys_efi_set_virtual_address_map( |
92 | unsigned long memory_map_size, | |
93 | unsigned long descriptor_size, | |
94 | u32 descriptor_version, | |
95 | efi_memory_desc_t *virtual_map) | |
96 | { | |
97 | efi_status_t status; | |
98 | ||
99 | efi_call_phys_prelog(); | |
62fa6e69 MF |
100 | status = efi_call_phys(efi_phys.set_virtual_address_map, |
101 | memory_map_size, descriptor_size, | |
102 | descriptor_version, virtual_map); | |
5b83683f HY |
103 | efi_call_phys_epilog(); |
104 | return status; | |
105 | } | |
106 | ||
3565184e | 107 | void efi_get_time(struct timespec *now) |
5b83683f HY |
108 | { |
109 | efi_status_t status; | |
110 | efi_time_t eft; | |
111 | efi_time_cap_t cap; | |
112 | ||
113 | status = efi.get_time(&eft, &cap); | |
114 | if (status != EFI_SUCCESS) | |
e3cb3f5a | 115 | pr_err("Oops: efitime: can't read time!\n"); |
5b83683f | 116 | |
3565184e DV |
117 | now->tv_sec = mktime(eft.year, eft.month, eft.day, eft.hour, |
118 | eft.minute, eft.second); | |
119 | now->tv_nsec = 0; | |
5b83683f HY |
120 | } |
121 | ||
69c91893 PJ |
122 | /* |
123 | * Tell the kernel about the EFI memory map. This might include | |
124 | * more than the max 128 entries that can fit in the e820 legacy | |
125 | * (zeropage) memory map. | |
126 | */ | |
127 | ||
200001eb | 128 | static void __init do_add_efi_memmap(void) |
69c91893 PJ |
129 | { |
130 | void *p; | |
131 | ||
132 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
133 | efi_memory_desc_t *md = p; | |
134 | unsigned long long start = md->phys_addr; | |
135 | unsigned long long size = md->num_pages << EFI_PAGE_SHIFT; | |
136 | int e820_type; | |
137 | ||
e2a71476 CW |
138 | switch (md->type) { |
139 | case EFI_LOADER_CODE: | |
140 | case EFI_LOADER_DATA: | |
141 | case EFI_BOOT_SERVICES_CODE: | |
142 | case EFI_BOOT_SERVICES_DATA: | |
143 | case EFI_CONVENTIONAL_MEMORY: | |
144 | if (md->attribute & EFI_MEMORY_WB) | |
145 | e820_type = E820_RAM; | |
146 | else | |
147 | e820_type = E820_RESERVED; | |
148 | break; | |
149 | case EFI_ACPI_RECLAIM_MEMORY: | |
150 | e820_type = E820_ACPI; | |
151 | break; | |
152 | case EFI_ACPI_MEMORY_NVS: | |
153 | e820_type = E820_NVS; | |
154 | break; | |
155 | case EFI_UNUSABLE_MEMORY: | |
156 | e820_type = E820_UNUSABLE; | |
157 | break; | |
158 | default: | |
159 | /* | |
160 | * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE | |
161 | * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO | |
162 | * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE | |
163 | */ | |
69c91893 | 164 | e820_type = E820_RESERVED; |
e2a71476 CW |
165 | break; |
166 | } | |
d0be6bde | 167 | e820_add_region(start, size, e820_type); |
69c91893 PJ |
168 | } |
169 | sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); | |
170 | } | |
171 | ||
1adbfa35 | 172 | int __init efi_memblock_x86_reserve_range(void) |
ecacf09f | 173 | { |
15b9c359 | 174 | struct efi_info *e = &boot_params.efi_info; |
ecacf09f HY |
175 | unsigned long pmap; |
176 | ||
9f27bc54 DK |
177 | if (efi_enabled(EFI_PARAVIRT)) |
178 | return 0; | |
179 | ||
05486fa7 | 180 | #ifdef CONFIG_X86_32 |
1adbfa35 | 181 | /* Can't handle data above 4GB at this time */ |
15b9c359 | 182 | if (e->efi_memmap_hi) { |
1adbfa35 OJ |
183 | pr_err("Memory map is above 4GB, disabling EFI.\n"); |
184 | return -EINVAL; | |
185 | } | |
15b9c359 | 186 | pmap = e->efi_memmap; |
05486fa7 | 187 | #else |
15b9c359 | 188 | pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32)); |
ecacf09f | 189 | #endif |
15b9c359 BP |
190 | memmap.phys_map = (void *)pmap; |
191 | memmap.nr_map = e->efi_memmap_size / | |
192 | e->efi_memdesc_size; | |
193 | memmap.desc_size = e->efi_memdesc_size; | |
194 | memmap.desc_version = e->efi_memdesc_version; | |
195 | ||
24aa0788 | 196 | memblock_reserve(pmap, memmap.nr_map * memmap.desc_size); |
1adbfa35 | 197 | |
258f6fd7 LL |
198 | efi.memmap = &memmap; |
199 | ||
1adbfa35 | 200 | return 0; |
ecacf09f HY |
201 | } |
202 | ||
5b83683f HY |
203 | static void __init print_efi_memmap(void) |
204 | { | |
f4fccac0 | 205 | #ifdef EFI_DEBUG |
5b83683f HY |
206 | efi_memory_desc_t *md; |
207 | void *p; | |
208 | int i; | |
209 | ||
210 | for (p = memmap.map, i = 0; | |
211 | p < memmap.map_end; | |
212 | p += memmap.desc_size, i++) { | |
213 | md = p; | |
9b7d2049 | 214 | pr_info("mem%02u: type=%u, attr=0x%llx, range=[0x%016llx-0x%016llx) (%lluMB)\n", |
5b83683f HY |
215 | i, md->type, md->attribute, md->phys_addr, |
216 | md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT), | |
217 | (md->num_pages >> (20 - EFI_PAGE_SHIFT))); | |
218 | } | |
5b83683f | 219 | #endif /* EFI_DEBUG */ |
f4fccac0 | 220 | } |
5b83683f | 221 | |
5189c2a7 | 222 | void __init efi_unmap_memmap(void) |
78510792 | 223 | { |
3e909599 | 224 | clear_bit(EFI_MEMMAP, &efi.flags); |
78510792 | 225 | if (memmap.map) { |
abc93f8e | 226 | early_memunmap(memmap.map, memmap.nr_map * memmap.desc_size); |
78510792 JT |
227 | memmap.map = NULL; |
228 | } | |
229 | } | |
230 | ||
140bf275 | 231 | static int __init efi_systab_init(void *phys) |
5b83683f | 232 | { |
83e68189 | 233 | if (efi_enabled(EFI_64BIT)) { |
1adbfa35 | 234 | efi_system_table_64_t *systab64; |
1fec0533 | 235 | struct efi_setup_data *data = NULL; |
1adbfa35 OJ |
236 | u64 tmp = 0; |
237 | ||
1fec0533 DY |
238 | if (efi_setup) { |
239 | data = early_memremap(efi_setup, sizeof(*data)); | |
240 | if (!data) | |
241 | return -ENOMEM; | |
242 | } | |
abc93f8e | 243 | systab64 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
244 | sizeof(*systab64)); |
245 | if (systab64 == NULL) { | |
246 | pr_err("Couldn't map the system table!\n"); | |
1fec0533 | 247 | if (data) |
abc93f8e | 248 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
249 | return -ENOMEM; |
250 | } | |
251 | ||
252 | efi_systab.hdr = systab64->hdr; | |
1fec0533 DY |
253 | efi_systab.fw_vendor = data ? (unsigned long)data->fw_vendor : |
254 | systab64->fw_vendor; | |
255 | tmp |= data ? data->fw_vendor : systab64->fw_vendor; | |
1adbfa35 OJ |
256 | efi_systab.fw_revision = systab64->fw_revision; |
257 | efi_systab.con_in_handle = systab64->con_in_handle; | |
258 | tmp |= systab64->con_in_handle; | |
259 | efi_systab.con_in = systab64->con_in; | |
260 | tmp |= systab64->con_in; | |
261 | efi_systab.con_out_handle = systab64->con_out_handle; | |
262 | tmp |= systab64->con_out_handle; | |
263 | efi_systab.con_out = systab64->con_out; | |
264 | tmp |= systab64->con_out; | |
265 | efi_systab.stderr_handle = systab64->stderr_handle; | |
266 | tmp |= systab64->stderr_handle; | |
267 | efi_systab.stderr = systab64->stderr; | |
268 | tmp |= systab64->stderr; | |
1fec0533 DY |
269 | efi_systab.runtime = data ? |
270 | (void *)(unsigned long)data->runtime : | |
271 | (void *)(unsigned long)systab64->runtime; | |
272 | tmp |= data ? data->runtime : systab64->runtime; | |
1adbfa35 OJ |
273 | efi_systab.boottime = (void *)(unsigned long)systab64->boottime; |
274 | tmp |= systab64->boottime; | |
275 | efi_systab.nr_tables = systab64->nr_tables; | |
1fec0533 DY |
276 | efi_systab.tables = data ? (unsigned long)data->tables : |
277 | systab64->tables; | |
278 | tmp |= data ? data->tables : systab64->tables; | |
1adbfa35 | 279 | |
abc93f8e | 280 | early_memunmap(systab64, sizeof(*systab64)); |
1fec0533 | 281 | if (data) |
abc93f8e | 282 | early_memunmap(data, sizeof(*data)); |
1adbfa35 OJ |
283 | #ifdef CONFIG_X86_32 |
284 | if (tmp >> 32) { | |
285 | pr_err("EFI data located above 4GB, disabling EFI.\n"); | |
286 | return -EINVAL; | |
287 | } | |
288 | #endif | |
289 | } else { | |
290 | efi_system_table_32_t *systab32; | |
291 | ||
abc93f8e | 292 | systab32 = early_memremap((unsigned long)phys, |
1adbfa35 OJ |
293 | sizeof(*systab32)); |
294 | if (systab32 == NULL) { | |
295 | pr_err("Couldn't map the system table!\n"); | |
296 | return -ENOMEM; | |
297 | } | |
298 | ||
299 | efi_systab.hdr = systab32->hdr; | |
300 | efi_systab.fw_vendor = systab32->fw_vendor; | |
301 | efi_systab.fw_revision = systab32->fw_revision; | |
302 | efi_systab.con_in_handle = systab32->con_in_handle; | |
303 | efi_systab.con_in = systab32->con_in; | |
304 | efi_systab.con_out_handle = systab32->con_out_handle; | |
305 | efi_systab.con_out = systab32->con_out; | |
306 | efi_systab.stderr_handle = systab32->stderr_handle; | |
307 | efi_systab.stderr = systab32->stderr; | |
308 | efi_systab.runtime = (void *)(unsigned long)systab32->runtime; | |
309 | efi_systab.boottime = (void *)(unsigned long)systab32->boottime; | |
310 | efi_systab.nr_tables = systab32->nr_tables; | |
311 | efi_systab.tables = systab32->tables; | |
312 | ||
abc93f8e | 313 | early_memunmap(systab32, sizeof(*systab32)); |
140bf275 | 314 | } |
1adbfa35 | 315 | |
5b83683f HY |
316 | efi.systab = &efi_systab; |
317 | ||
318 | /* | |
319 | * Verify the EFI Table | |
320 | */ | |
140bf275 | 321 | if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { |
e3cb3f5a | 322 | pr_err("System table signature incorrect!\n"); |
140bf275 OJ |
323 | return -EINVAL; |
324 | } | |
5b83683f | 325 | if ((efi.systab->hdr.revision >> 16) == 0) |
9b7d2049 | 326 | pr_err("Warning: System table version %d.%02d, expected 1.00 or greater!\n", |
5b83683f HY |
327 | efi.systab->hdr.revision >> 16, |
328 | efi.systab->hdr.revision & 0xffff); | |
140bf275 | 329 | |
0f8093a9 MF |
330 | set_bit(EFI_SYSTEM_TABLES, &efi.flags); |
331 | ||
140bf275 | 332 | return 0; |
83e7ee66 | 333 | } |
5b83683f | 334 | |
4f9dbcfc | 335 | static int __init efi_runtime_init32(void) |
83e7ee66 | 336 | { |
4f9dbcfc MF |
337 | efi_runtime_services_32_t *runtime; |
338 | ||
abc93f8e | 339 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc MF |
340 | sizeof(efi_runtime_services_32_t)); |
341 | if (!runtime) { | |
342 | pr_err("Could not map the runtime service table!\n"); | |
343 | return -ENOMEM; | |
344 | } | |
5b83683f HY |
345 | |
346 | /* | |
4f9dbcfc MF |
347 | * We will only need *early* access to the following two |
348 | * EFI runtime services before set_virtual_address_map | |
349 | * is invoked. | |
5b83683f | 350 | */ |
4f9dbcfc MF |
351 | efi_phys.set_virtual_address_map = |
352 | (efi_set_virtual_address_map_t *) | |
353 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 354 | early_memunmap(runtime, sizeof(efi_runtime_services_32_t)); |
4f9dbcfc MF |
355 | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static int __init efi_runtime_init64(void) | |
360 | { | |
361 | efi_runtime_services_64_t *runtime; | |
362 | ||
abc93f8e | 363 | runtime = early_memremap((unsigned long)efi.systab->runtime, |
4f9dbcfc | 364 | sizeof(efi_runtime_services_64_t)); |
140bf275 | 365 | if (!runtime) { |
e3cb3f5a | 366 | pr_err("Could not map the runtime service table!\n"); |
140bf275 OJ |
367 | return -ENOMEM; |
368 | } | |
4f9dbcfc | 369 | |
140bf275 | 370 | /* |
4f9dbcfc MF |
371 | * We will only need *early* access to the following two |
372 | * EFI runtime services before set_virtual_address_map | |
140bf275 OJ |
373 | * is invoked. |
374 | */ | |
140bf275 | 375 | efi_phys.set_virtual_address_map = |
4f9dbcfc MF |
376 | (efi_set_virtual_address_map_t *) |
377 | (unsigned long)runtime->set_virtual_address_map; | |
abc93f8e | 378 | early_memunmap(runtime, sizeof(efi_runtime_services_64_t)); |
4f9dbcfc MF |
379 | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static int __init efi_runtime_init(void) | |
384 | { | |
385 | int rv; | |
386 | ||
387 | /* | |
388 | * Check out the runtime services table. We need to map | |
389 | * the runtime services table so that we can grab the physical | |
390 | * address of several of the EFI runtime functions, needed to | |
391 | * set the firmware into virtual mode. | |
9f27bc54 DK |
392 | * |
393 | * When EFI_PARAVIRT is in force then we could not map runtime | |
394 | * service memory region because we do not have direct access to it. | |
395 | * However, runtime services are available through proxy functions | |
396 | * (e.g. in case of Xen dom0 EFI implementation they call special | |
397 | * hypercall which executes relevant EFI functions) and that is why | |
398 | * they are always enabled. | |
4f9dbcfc | 399 | */ |
4f9dbcfc | 400 | |
9f27bc54 DK |
401 | if (!efi_enabled(EFI_PARAVIRT)) { |
402 | if (efi_enabled(EFI_64BIT)) | |
403 | rv = efi_runtime_init64(); | |
404 | else | |
405 | rv = efi_runtime_init32(); | |
406 | ||
407 | if (rv) | |
408 | return rv; | |
409 | } | |
140bf275 | 410 | |
0f8093a9 MF |
411 | set_bit(EFI_RUNTIME_SERVICES, &efi.flags); |
412 | ||
140bf275 | 413 | return 0; |
83e7ee66 | 414 | } |
5b83683f | 415 | |
140bf275 | 416 | static int __init efi_memmap_init(void) |
83e7ee66 | 417 | { |
9f27bc54 DK |
418 | if (efi_enabled(EFI_PARAVIRT)) |
419 | return 0; | |
420 | ||
5b83683f | 421 | /* Map the EFI memory map */ |
abc93f8e | 422 | memmap.map = early_memremap((unsigned long)memmap.phys_map, |
beacfaac | 423 | memmap.nr_map * memmap.desc_size); |
140bf275 | 424 | if (memmap.map == NULL) { |
e3cb3f5a | 425 | pr_err("Could not map the memory map!\n"); |
140bf275 OJ |
426 | return -ENOMEM; |
427 | } | |
5b83683f | 428 | memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size); |
175e438f | 429 | |
200001eb PJ |
430 | if (add_efi_memmap) |
431 | do_add_efi_memmap(); | |
140bf275 | 432 | |
0f8093a9 MF |
433 | set_bit(EFI_MEMMAP, &efi.flags); |
434 | ||
140bf275 | 435 | return 0; |
83e7ee66 OJ |
436 | } |
437 | ||
438 | void __init efi_init(void) | |
439 | { | |
440 | efi_char16_t *c16; | |
441 | char vendor[100] = "unknown"; | |
442 | int i = 0; | |
443 | void *tmp; | |
444 | ||
445 | #ifdef CONFIG_X86_32 | |
1adbfa35 OJ |
446 | if (boot_params.efi_info.efi_systab_hi || |
447 | boot_params.efi_info.efi_memmap_hi) { | |
448 | pr_info("Table located above 4GB, disabling EFI.\n"); | |
1adbfa35 OJ |
449 | return; |
450 | } | |
83e7ee66 OJ |
451 | efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab; |
452 | #else | |
453 | efi_phys.systab = (efi_system_table_t *) | |
1adbfa35 OJ |
454 | (boot_params.efi_info.efi_systab | |
455 | ((__u64)boot_params.efi_info.efi_systab_hi<<32)); | |
83e7ee66 OJ |
456 | #endif |
457 | ||
83e68189 | 458 | if (efi_systab_init(efi_phys.systab)) |
140bf275 | 459 | return; |
83e68189 | 460 | |
a0998eb1 DY |
461 | efi.config_table = (unsigned long)efi.systab->tables; |
462 | efi.fw_vendor = (unsigned long)efi.systab->fw_vendor; | |
463 | efi.runtime = (unsigned long)efi.systab->runtime; | |
464 | ||
83e7ee66 OJ |
465 | /* |
466 | * Show what we know for posterity | |
467 | */ | |
abc93f8e | 468 | c16 = tmp = early_memremap(efi.systab->fw_vendor, 2); |
83e7ee66 OJ |
469 | if (c16) { |
470 | for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i) | |
471 | vendor[i] = *c16++; | |
472 | vendor[i] = '\0'; | |
473 | } else | |
e3cb3f5a | 474 | pr_err("Could not map the firmware vendor!\n"); |
abc93f8e | 475 | early_memunmap(tmp, 2); |
83e7ee66 | 476 | |
e3cb3f5a OJ |
477 | pr_info("EFI v%u.%.02u by %s\n", |
478 | efi.systab->hdr.revision >> 16, | |
479 | efi.systab->hdr.revision & 0xffff, vendor); | |
83e7ee66 | 480 | |
1fec0533 DY |
481 | if (efi_reuse_config(efi.systab->tables, efi.systab->nr_tables)) |
482 | return; | |
483 | ||
272686bf | 484 | if (efi_config_init(arch_tables)) |
140bf275 | 485 | return; |
83e68189 | 486 | |
1adbfa35 OJ |
487 | /* |
488 | * Note: We currently don't support runtime services on an EFI | |
489 | * that doesn't match the kernel 32/64-bit mode. | |
490 | */ | |
491 | ||
7d453eee | 492 | if (!efi_runtime_supported()) |
1adbfa35 | 493 | pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n"); |
83e68189 | 494 | else { |
fb834c7a | 495 | if (disable_runtime || efi_runtime_init()) |
83e68189 | 496 | return; |
140bf275 | 497 | } |
83e68189 | 498 | if (efi_memmap_init()) |
140bf275 | 499 | return; |
83e68189 | 500 | |
5b83683f | 501 | print_efi_memmap(); |
5b83683f HY |
502 | } |
503 | ||
2223af38 JT |
504 | void __init efi_late_init(void) |
505 | { | |
506 | efi_bgrt_init(); | |
507 | } | |
508 | ||
9cd2b07c MG |
509 | void __init efi_set_executable(efi_memory_desc_t *md, bool executable) |
510 | { | |
511 | u64 addr, npages; | |
512 | ||
513 | addr = md->virt_addr; | |
514 | npages = md->num_pages; | |
515 | ||
516 | memrange_efi_to_native(&addr, &npages); | |
517 | ||
518 | if (executable) | |
519 | set_memory_x(addr, npages); | |
520 | else | |
521 | set_memory_nx(addr, npages); | |
522 | } | |
523 | ||
c55d016f | 524 | void __init runtime_code_page_mkexec(void) |
a2172e25 HY |
525 | { |
526 | efi_memory_desc_t *md; | |
a2172e25 HY |
527 | void *p; |
528 | ||
a2172e25 HY |
529 | /* Make EFI runtime service code area executable */ |
530 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
531 | md = p; | |
1c083eb2 HY |
532 | |
533 | if (md->type != EFI_RUNTIME_SERVICES_CODE) | |
534 | continue; | |
535 | ||
9cd2b07c | 536 | efi_set_executable(md, true); |
a2172e25 | 537 | } |
a2172e25 | 538 | } |
a2172e25 | 539 | |
3e8fa263 MF |
540 | void efi_memory_uc(u64 addr, unsigned long size) |
541 | { | |
542 | unsigned long page_shift = 1UL << EFI_PAGE_SHIFT; | |
543 | u64 npages; | |
544 | ||
545 | npages = round_up(size, page_shift) / page_shift; | |
546 | memrange_efi_to_native(&addr, &npages); | |
547 | set_memory_uc(addr, npages); | |
548 | } | |
549 | ||
d2f7cbe7 BP |
550 | void __init old_map_region(efi_memory_desc_t *md) |
551 | { | |
552 | u64 start_pfn, end_pfn, end; | |
553 | unsigned long size; | |
554 | void *va; | |
555 | ||
556 | start_pfn = PFN_DOWN(md->phys_addr); | |
557 | size = md->num_pages << PAGE_SHIFT; | |
558 | end = md->phys_addr + size; | |
559 | end_pfn = PFN_UP(end); | |
560 | ||
561 | if (pfn_range_is_mapped(start_pfn, end_pfn)) { | |
562 | va = __va(md->phys_addr); | |
563 | ||
564 | if (!(md->attribute & EFI_MEMORY_WB)) | |
565 | efi_memory_uc((u64)(unsigned long)va, size); | |
566 | } else | |
567 | va = efi_ioremap(md->phys_addr, size, | |
568 | md->type, md->attribute); | |
569 | ||
570 | md->virt_addr = (u64) (unsigned long) va; | |
571 | if (!va) | |
572 | pr_err("ioremap of 0x%llX failed!\n", | |
573 | (unsigned long long)md->phys_addr); | |
574 | } | |
575 | ||
481f75c0 DY |
576 | /* Merge contiguous regions of the same type and attribute */ |
577 | static void __init efi_merge_regions(void) | |
5b83683f | 578 | { |
481f75c0 | 579 | void *p; |
202f9d0a | 580 | efi_memory_desc_t *md, *prev_md = NULL; |
202f9d0a | 581 | |
202f9d0a MG |
582 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
583 | u64 prev_size; | |
584 | md = p; | |
585 | ||
586 | if (!prev_md) { | |
587 | prev_md = md; | |
588 | continue; | |
589 | } | |
590 | ||
591 | if (prev_md->type != md->type || | |
592 | prev_md->attribute != md->attribute) { | |
593 | prev_md = md; | |
594 | continue; | |
595 | } | |
596 | ||
597 | prev_size = prev_md->num_pages << EFI_PAGE_SHIFT; | |
598 | ||
599 | if (md->phys_addr == (prev_md->phys_addr + prev_size)) { | |
600 | prev_md->num_pages += md->num_pages; | |
601 | md->type = EFI_RESERVED_TYPE; | |
602 | md->attribute = 0; | |
603 | continue; | |
604 | } | |
605 | prev_md = md; | |
481f75c0 DY |
606 | } |
607 | } | |
608 | ||
609 | static void __init get_systab_virt_addr(efi_memory_desc_t *md) | |
610 | { | |
611 | unsigned long size; | |
612 | u64 end, systab; | |
d2f7cbe7 | 613 | |
481f75c0 DY |
614 | size = md->num_pages << EFI_PAGE_SHIFT; |
615 | end = md->phys_addr + size; | |
616 | systab = (u64)(unsigned long)efi_phys.systab; | |
617 | if (md->phys_addr <= systab && systab < end) { | |
618 | systab += md->virt_addr - md->phys_addr; | |
619 | efi.systab = (efi_system_table_t *)(unsigned long)systab; | |
202f9d0a | 620 | } |
481f75c0 DY |
621 | } |
622 | ||
fabb37c7 | 623 | static void __init save_runtime_map(void) |
926172d4 | 624 | { |
fabb37c7 | 625 | #ifdef CONFIG_KEXEC |
926172d4 DY |
626 | efi_memory_desc_t *md; |
627 | void *tmp, *p, *q = NULL; | |
628 | int count = 0; | |
629 | ||
a3530e8f DY |
630 | if (efi_enabled(EFI_OLD_MEMMAP)) |
631 | return; | |
632 | ||
926172d4 DY |
633 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
634 | md = p; | |
635 | ||
636 | if (!(md->attribute & EFI_MEMORY_RUNTIME) || | |
637 | (md->type == EFI_BOOT_SERVICES_CODE) || | |
638 | (md->type == EFI_BOOT_SERVICES_DATA)) | |
639 | continue; | |
640 | tmp = krealloc(q, (count + 1) * memmap.desc_size, GFP_KERNEL); | |
641 | if (!tmp) | |
642 | goto out; | |
643 | q = tmp; | |
644 | ||
645 | memcpy(q + count * memmap.desc_size, md, memmap.desc_size); | |
646 | count++; | |
647 | } | |
648 | ||
518548ab | 649 | efi_runtime_map_setup(q, count, memmap.desc_size); |
fabb37c7 | 650 | return; |
926172d4 | 651 | |
926172d4 DY |
652 | out: |
653 | kfree(q); | |
fabb37c7 BP |
654 | pr_err("Error saving runtime map, efi runtime on kexec non-functional!!\n"); |
655 | #endif | |
1fec0533 DY |
656 | } |
657 | ||
b7b898ae BP |
658 | static void *realloc_pages(void *old_memmap, int old_shift) |
659 | { | |
660 | void *ret; | |
661 | ||
662 | ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1); | |
663 | if (!ret) | |
664 | goto out; | |
665 | ||
666 | /* | |
667 | * A first-time allocation doesn't have anything to copy. | |
668 | */ | |
669 | if (!old_memmap) | |
670 | return ret; | |
671 | ||
672 | memcpy(ret, old_memmap, PAGE_SIZE << old_shift); | |
673 | ||
674 | out: | |
675 | free_pages((unsigned long)old_memmap, old_shift); | |
676 | return ret; | |
677 | } | |
678 | ||
481f75c0 | 679 | /* |
b7b898ae BP |
680 | * Map the efi memory ranges of the runtime services and update new_mmap with |
681 | * virtual addresses. | |
481f75c0 | 682 | */ |
b7b898ae | 683 | static void * __init efi_map_regions(int *count, int *pg_shift) |
481f75c0 | 684 | { |
b7b898ae BP |
685 | void *p, *new_memmap = NULL; |
686 | unsigned long left = 0; | |
481f75c0 | 687 | efi_memory_desc_t *md; |
202f9d0a | 688 | |
5b83683f HY |
689 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
690 | md = p; | |
70087011 JB |
691 | if (!(md->attribute & EFI_MEMORY_RUNTIME)) { |
692 | #ifdef CONFIG_X86_64 | |
693 | if (md->type != EFI_BOOT_SERVICES_CODE && | |
694 | md->type != EFI_BOOT_SERVICES_DATA) | |
695 | #endif | |
696 | continue; | |
697 | } | |
1c083eb2 | 698 | |
d2f7cbe7 | 699 | efi_map_region(md); |
481f75c0 DY |
700 | get_systab_virt_addr(md); |
701 | ||
b7b898ae BP |
702 | if (left < memmap.desc_size) { |
703 | new_memmap = realloc_pages(new_memmap, *pg_shift); | |
704 | if (!new_memmap) | |
705 | return NULL; | |
706 | ||
707 | left += PAGE_SIZE << *pg_shift; | |
708 | (*pg_shift)++; | |
709 | } | |
710 | ||
481f75c0 DY |
711 | memcpy(new_memmap + (*count * memmap.desc_size), md, |
712 | memmap.desc_size); | |
b7b898ae BP |
713 | |
714 | left -= memmap.desc_size; | |
481f75c0 DY |
715 | (*count)++; |
716 | } | |
d2f7cbe7 | 717 | |
481f75c0 | 718 | return new_memmap; |
481f75c0 DY |
719 | } |
720 | ||
fabb37c7 BP |
721 | static void __init kexec_enter_virtual_mode(void) |
722 | { | |
723 | #ifdef CONFIG_KEXEC | |
724 | efi_memory_desc_t *md; | |
725 | void *p; | |
726 | ||
727 | efi.systab = NULL; | |
728 | ||
729 | /* | |
730 | * We don't do virtual mode, since we don't do runtime services, on | |
731 | * non-native EFI | |
732 | */ | |
733 | if (!efi_is_native()) { | |
734 | efi_unmap_memmap(); | |
735 | return; | |
736 | } | |
737 | ||
738 | /* | |
739 | * Map efi regions which were passed via setup_data. The virt_addr is a | |
740 | * fixed addr which was used in first kernel of a kexec boot. | |
741 | */ | |
742 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { | |
743 | md = p; | |
744 | efi_map_region_fixed(md); /* FIXME: add error handling */ | |
745 | get_systab_virt_addr(md); | |
746 | } | |
747 | ||
748 | save_runtime_map(); | |
749 | ||
750 | BUG_ON(!efi.systab); | |
751 | ||
752 | efi_sync_low_kernel_mappings(); | |
753 | ||
754 | /* | |
755 | * Now that EFI is in virtual mode, update the function | |
756 | * pointers in the runtime service table to the new virtual addresses. | |
757 | * | |
758 | * Call EFI services through wrapper functions. | |
759 | */ | |
760 | efi.runtime_version = efi_systab.hdr.revision; | |
994448f1 | 761 | |
022ee6c5 | 762 | efi_native_runtime_setup(); |
994448f1 | 763 | |
fabb37c7 | 764 | efi.set_virtual_address_map = NULL; |
fabb37c7 BP |
765 | |
766 | if (efi_enabled(EFI_OLD_MEMMAP) && (__supported_pte_mask & _PAGE_NX)) | |
767 | runtime_code_page_mkexec(); | |
768 | ||
769 | /* clean DUMMY object */ | |
eeb9db09 | 770 | efi_delete_dummy_variable(); |
fabb37c7 BP |
771 | #endif |
772 | } | |
773 | ||
481f75c0 DY |
774 | /* |
775 | * This function will switch the EFI runtime services to virtual mode. | |
776 | * Essentially, we look through the EFI memmap and map every region that | |
777 | * has the runtime attribute bit set in its memory descriptor into the | |
778 | * ->trampoline_pgd page table using a top-down VA allocation scheme. | |
779 | * | |
780 | * The old method which used to update that memory descriptor with the | |
781 | * virtual address obtained from ioremap() is still supported when the | |
782 | * kernel is booted with efi=old_map on its command line. Same old | |
783 | * method enabled the runtime services to be called without having to | |
784 | * thunk back into physical mode for every invocation. | |
785 | * | |
786 | * The new method does a pagetable switch in a preemption-safe manner | |
787 | * so that we're in a different address space when calling a runtime | |
788 | * function. For function arguments passing we do copy the PGDs of the | |
789 | * kernel page table into ->trampoline_pgd prior to each call. | |
1fec0533 DY |
790 | * |
791 | * Specially for kexec boot, efi runtime maps in previous kernel should | |
792 | * be passed in via setup_data. In that case runtime ranges will be mapped | |
fabb37c7 BP |
793 | * to the same virtual addresses as the first kernel, see |
794 | * kexec_enter_virtual_mode(). | |
481f75c0 | 795 | */ |
fabb37c7 | 796 | static void __init __efi_enter_virtual_mode(void) |
481f75c0 | 797 | { |
fabb37c7 | 798 | int count = 0, pg_shift = 0; |
481f75c0 | 799 | void *new_memmap = NULL; |
b7b898ae | 800 | efi_status_t status; |
1c083eb2 | 801 | |
481f75c0 | 802 | efi.systab = NULL; |
d2f7cbe7 | 803 | |
fabb37c7 BP |
804 | efi_merge_regions(); |
805 | new_memmap = efi_map_regions(&count, &pg_shift); | |
806 | if (!new_memmap) { | |
807 | pr_err("Error reallocating memory, EFI runtime non-functional!\n"); | |
808 | return; | |
b7b898ae | 809 | } |
926172d4 | 810 | |
fabb37c7 BP |
811 | save_runtime_map(); |
812 | ||
5b83683f HY |
813 | BUG_ON(!efi.systab); |
814 | ||
fabb37c7 BP |
815 | if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) |
816 | return; | |
b7b898ae | 817 | |
d2f7cbe7 | 818 | efi_sync_low_kernel_mappings(); |
11cc8512 | 819 | efi_dump_pagetable(); |
d2f7cbe7 | 820 | |
994448f1 MF |
821 | if (efi_is_native()) { |
822 | status = phys_efi_set_virtual_address_map( | |
823 | memmap.desc_size * count, | |
824 | memmap.desc_size, | |
825 | memmap.desc_version, | |
826 | (efi_memory_desc_t *)__pa(new_memmap)); | |
827 | } else { | |
828 | status = efi_thunk_set_virtual_address_map( | |
829 | efi_phys.set_virtual_address_map, | |
830 | memmap.desc_size * count, | |
831 | memmap.desc_size, | |
832 | memmap.desc_version, | |
833 | (efi_memory_desc_t *)__pa(new_memmap)); | |
834 | } | |
1fec0533 | 835 | |
fabb37c7 BP |
836 | if (status != EFI_SUCCESS) { |
837 | pr_alert("Unable to switch EFI into virtual mode (status=%lx)!\n", | |
838 | status); | |
839 | panic("EFI call to SetVirtualAddressMap() failed!"); | |
5b83683f HY |
840 | } |
841 | ||
842 | /* | |
843 | * Now that EFI is in virtual mode, update the function | |
844 | * pointers in the runtime service table to the new virtual addresses. | |
845 | * | |
846 | * Call EFI services through wrapper functions. | |
847 | */ | |
712ba9e9 | 848 | efi.runtime_version = efi_systab.hdr.revision; |
4f9dbcfc MF |
849 | |
850 | if (efi_is_native()) | |
022ee6c5 | 851 | efi_native_runtime_setup(); |
4f9dbcfc MF |
852 | else |
853 | efi_thunk_runtime_setup(); | |
854 | ||
2b5e8ef3 | 855 | efi.set_virtual_address_map = NULL; |
d2f7cbe7 | 856 | |
c55d016f | 857 | efi_runtime_mkexec(); |
1adbfa35 | 858 | |
b7b898ae BP |
859 | /* |
860 | * We mapped the descriptor array into the EFI pagetable above but we're | |
861 | * not unmapping it here. Here's why: | |
862 | * | |
863 | * We're copying select PGDs from the kernel page table to the EFI page | |
864 | * table and when we do so and make changes to those PGDs like unmapping | |
865 | * stuff from them, those changes appear in the kernel page table and we | |
866 | * go boom. | |
867 | * | |
868 | * From setup_real_mode(): | |
869 | * | |
870 | * ... | |
871 | * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd; | |
872 | * | |
873 | * In this particular case, our allocation is in PGD 0 of the EFI page | |
874 | * table but we've copied that PGD from PGD[272] of the EFI page table: | |
875 | * | |
876 | * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272 | |
877 | * | |
878 | * where the direct memory mapping in kernel space is. | |
879 | * | |
880 | * new_memmap's VA comes from that direct mapping and thus clearing it, | |
881 | * it would get cleared in the kernel page table too. | |
882 | * | |
883 | * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift); | |
884 | */ | |
fabb37c7 | 885 | free_pages((unsigned long)new_memmap, pg_shift); |
f8b84043 MG |
886 | |
887 | /* clean DUMMY object */ | |
eeb9db09 | 888 | efi_delete_dummy_variable(); |
5b83683f HY |
889 | } |
890 | ||
fabb37c7 BP |
891 | void __init efi_enter_virtual_mode(void) |
892 | { | |
9f27bc54 DK |
893 | if (efi_enabled(EFI_PARAVIRT)) |
894 | return; | |
895 | ||
fabb37c7 BP |
896 | if (efi_setup) |
897 | kexec_enter_virtual_mode(); | |
898 | else | |
899 | __efi_enter_virtual_mode(); | |
900 | } | |
901 | ||
5b83683f HY |
902 | /* |
903 | * Convenience functions to obtain memory types and attributes | |
904 | */ | |
905 | u32 efi_mem_type(unsigned long phys_addr) | |
906 | { | |
907 | efi_memory_desc_t *md; | |
908 | void *p; | |
909 | ||
83e68189 MF |
910 | if (!efi_enabled(EFI_MEMMAP)) |
911 | return 0; | |
912 | ||
5b83683f HY |
913 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
914 | md = p; | |
915 | if ((md->phys_addr <= phys_addr) && | |
916 | (phys_addr < (md->phys_addr + | |
917 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
918 | return md->type; | |
919 | } | |
920 | return 0; | |
921 | } | |
922 | ||
923 | u64 efi_mem_attributes(unsigned long phys_addr) | |
924 | { | |
925 | efi_memory_desc_t *md; | |
926 | void *p; | |
927 | ||
67a9b9c5 DK |
928 | if (!efi_enabled(EFI_MEMMAP)) |
929 | return 0; | |
930 | ||
5b83683f HY |
931 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
932 | md = p; | |
933 | if ((md->phys_addr <= phys_addr) && | |
934 | (phys_addr < (md->phys_addr + | |
935 | (md->num_pages << EFI_PAGE_SHIFT)))) | |
936 | return md->attribute; | |
937 | } | |
938 | return 0; | |
939 | } | |
a6e4d5a0 | 940 | |
d2f7cbe7 BP |
941 | static int __init parse_efi_cmdline(char *str) |
942 | { | |
943 | if (*str == '=') | |
944 | str++; | |
945 | ||
946 | if (!strncmp(str, "old_map", 7)) | |
0f8093a9 | 947 | set_bit(EFI_OLD_MEMMAP, &efi.flags); |
d2f7cbe7 BP |
948 | |
949 | return 0; | |
950 | } | |
951 | early_param("efi", parse_efi_cmdline); |